Why proofreaders are important

I am going to type, letter for letter, the text of the ad for The Rick Mercer Report that appears on page A4 of today's Globe and Mail. Unfortunately I do not have a scanner, but rest assured that I am going to make absolutely certain my typing is accurate before I post this:

This week,

Rick visit's the University of Guelplh's Veterinary College

It was just a hairball. He's okay now.

The Rick Mercer Report
Tonight at 8/8:30 NT

I am very, very surprised to see a major typo and a misplaced apostrophe, both in the same ad, get past both the CBC ad-copy-checker-people AND the Globe and Mail people.